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Huawei HCIE-Datacom V1.0 Sample Questions (Q277-Q282):

NEW QUESTION # 277
Refer to the configuration in the figure. Which queue on R2 do packets of PC1 enter by default?

Answer: A

Explanation:
Comprehensive and Detailed
In the given configuration:
Traffic from PC1 (192.168.1.1) is classified by ACL 2000.
Traffic is remarked with DSCP value 26 (DSCP 26).
DSCP 26 corresponds to AF31, which maps to the AF3 queue in DiffServ QoS.
DiffServ QoS Queue Mapping:
EF (Expedited Forwarding) → DSCP 46
AF4 (Assured Forwarding Class 4) → DSCP 40-47
AF3 (Assured Forwarding Class 3) → DSCP 26-31 ✅
AF2 (Assured Forwarding Class 2) → DSCP 18-23
Since DSCP 26 falls within AF3, the packets enter the AF3 queue on R2.
📖 Reference: Huawei HCIE Datacom - QoS and DSCP Mapping


NEW QUESTION # 278
Regarding the Stub region and the NSSA region of the OSPF protocol , the following statement is incorrect with a single choice

Answer: A


NEW QUESTION # 279
NXLAN under different VPNs need to be accessed, one of the subnets is as follows, EVPN under RT 10: 10 both, RT 1000: 1000 export, VPN RT 100: 100 The other subnet can be configured as ?

Answer: A,B


NEW QUESTION # 280
To allow only authorized users (users who obtain IP addresses through authorized DHCP servers or use specified static IP addresses) to access the network shown in the figure, which of the following solutions can be used?

Answer: D

Explanation:
Understanding Network Security for Authorized User Access
# Problem Scenario:
Only authorized users should be allowed network access.
Users can obtain IP addresses either via DHCP or a predefined static IP list.
Unauthorized users (e.g., attackers using rogue DHCP servers or spoofed IPs) must be blocked.
# Required Technologies for Securing Access:
1##DHCP Snooping- Protects againstrogue DHCP serversand builds abinding table of legitimate DHCP clients.
2##IP Source Guard (IPSG)- Ensures that onlyauthorized IP-MAC bindingscan send traffic.
Analysis of the Answer Choices:
#A. DAI + Port Security (Incorrect)
DAI (Dynamic ARP Inspection)prevents ARP spoofingbut doesnot validate IP-MAC-DHCP bindings.
Port Securityonlylimits MAC addresses per portbut doesnot verify IP addresses.
Does NOT protect against unauthorized static IP users.
#B. DHCP Snooping + IPSG (Correct)
DHCP Snooping:
Preventsrogue DHCP servers from assigning unauthorized IPs.
Builds aDHCP binding table(IP-MAC-Port).
IP Source Guard (IPSG):
Blocks trafficfrom IPs not listed in the DHCP snooping binding table.
Can be configured to allow manually specified static IP addresses.
Best choice to allow only authorized users (both DHCP and static IP users).
#C. DHCP Snooping + DAI (Incorrect)
DAI (Dynamic ARP Inspection) prevents ARP spoofingbutdoes not block unauthorized static IP users.
Lacks IP-level access controlneeded to enforce static IP policies.
#D. DAI + IPSG (Incorrect)
IPSG (IP Source Guard) needs DHCP Snooping to build the binding table.
Without DHCP Snooping, IPSG cannot function properly.
DAI does not provide complete protection against unauthorized users.
Why is the Answer B (DHCP Snooping + IPSG)?
#Ensures only users assigned a DHCP IP (or authorized static IPs) can send traffic.
#Blocks rogue DHCP servers and unauthorized static IP users.
Real-World Application:
Enterprise Networks:Prevents unauthorizedstatic IP users or attackers from accessing VLANs.
Public Wi-Fi Security:Ensures onlyauthorized users receive IPs and can send traffic.
#Reference:Huawei HCIE-Datacom Guide - DHCP Snooping and IPSG Security Mechanisms


NEW QUESTION # 281
The following description of LDP reliability is incorrectly ?( Radio).

Answer: B


NEW QUESTION # 282
......

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